How the death of Alexander the Great triggered a brutal struggle for his empire
When Alexander the Great died without a clear successor, his top generals, the Diadochi, turned his vast conquests into a battlefield. The Second War of the Diadochi saw shifting alliances and bloody power plays, ultimately carving the empire into independent kingdoms and setting the stage for decades of further conflict.
The Second War of the Diadochi emerged from a succession crisis following the death of Antipater in 319 BC. Antipater had bypassed his son, Cassander, to name Polyperchon as the new Regent of the Empire. This decision fractured the leadership, pitting a coalition of Polyperchon, Olympias, and Eumenes against the formidable alliance of Cassander, Antigonus, Ptolemy, and Lysimachus. The conflict was not merely a struggle for titles but a violent scramble to secure control over the remnants of Alexander’s newly created empire.
The war unfolded across two main theaters. In Europe, Polyperchon’s failure to secure Greek cities led to a desperate retreat into Epirus. Alongside Olympias, he re-invaded Macedon, resulting in the capture and execution of King Philip Arrhidaeus and the forced suicide of his wife, Eurydice. However, Cassander eventually rallied, seized Macedon, and murdered Olympias, establishing himself as the dominant power in the European territories. Meanwhile, in Asia, the conflict centered on Eumenes, who utilized the royal treasury at Kyinda to recruit mercenaries and secure the loyalty of the elite Silver Shields. Despite his tactical maneuvers and an inconclusive battle at Paraitakene in 317 BC, Eumenes was eventually betrayed by his own troops after the battle of Gabiene in 316 BC and executed by Antigonus.
By the end of the war, the map of the ancient world had been fundamentally redrawn. Antigonus emerged as the master of Asia Minor and the eastern provinces, while Cassander held Macedon and Greece. Ptolemy solidified his grip on Egypt, Syria, Cyrene, and Cyprus, and Lysimachus controlled Thrace. This consolidation of power by Antigonus was so significant that it immediately threatened his former allies, sparking the Third War of the Diadochi. The territories Antigonus amassed would eventually provide the foundation for the Seleucid Empire, marking the transition from a unified conquest to a fragmented landscape of competing Hellenistic kingdoms.
The war is notable for the rapid shift in alliances and the ruthless elimination of the royal family. The execution of Philip Arrhidaeus and the murder of Olympias underscored the total collapse of central authority. While the battles of Paraitakene and Gabiene demonstrated the military parity between the generals, the ultimate victory of Antigonus and Cassander proved that control over resources and the ability to bribe key units, such as the Silver Shields, were as decisive as any battlefield maneuver.
Source: Second War of the Diadochi
